If the outside temperature sensor in your car is consistently reading too low and fluctuates with changing temperatures, averaging around -30⁰C, there are several possible issues that could be causing this problem:
Sensor Calibration Issue: The temperature sensor may be incorrectly calibrated, leading to inaccurate readings. Over time, temperature sensors can become less accurate due to environmental factors or wear and tear. A calibration issue could cause the sensor to consistently display lower temperatures than the actual ambient temperature.
Sensor Placement: The sensor may be poorly positioned or affected by external factors that cause it to read lower temperatures. For example, if the sensor is located in a spot where it is exposed to cold air drafts, shade, or other heat sinks, it can give inaccurate readings.
Wiring or Connection Problem: There could be a problem with the wiring or connection between the temperature sensor and the car's display unit. Faulty wiring or loose connections can result in incorrect temperature readings.
Sensor Damage: The temperature sensor itself may be damaged or faulty. Extreme temperatures, physical impact, or other factors could have damaged the sensor, affecting its accuracy.
Environmental Factors: Unusual environmental conditions, such as nearby sources of cold air or heat, can impact the temperature readings. For example, if the sensor is placed close to the car's engine or exhaust system, it may pick up the excess heat, leading to inaccurate readings.
To address this issue, you can try the following steps:
Check the sensor placement: Ensure that the sensor is not obstructed, exposed to extreme heat sources, or affected by drafts or shade. If possible, refer to your car's manual or consult a professional to confirm the correct placement.
Inspect the wiring and connections: Examine the wiring and connections leading to the temperature sensor. Look for any visible damage or loose connections. If you find any issues, consider repairing or replacing the affected components.
Sensor calibration or replacement: If you have access to calibration tools or diagnostics, you may attempt to recalibrate the temperature sensor. Alternatively, if the sensor is damaged or malfunctioning, it might need to be replaced. Consult a professional technician or refer to your car's manual for guidance.
It is recommended to have the issue diagnosed and repaired by a qualified mechanic or an authorized service center, as they have the necessary expertise and tools to accurately diagnose and fix temperature sensor issues in your car.